Home    About Us    News    Technical Reference     F.A.Q    Contact

Injection Mold
Injection Molding
Die Casting Mold
Rapid Prototyping
Quality Assurance
Quote Form
Site Map



��Technical Reference ---- ��Product Design

Product Design �C Wall Thickness


Nominal Wall Thickness

For parts made from most thermoplastics, nominal wall thickness should not exceed 4.0 mm. Walls thicker than 4.0 mm will result in increased cycle times (due to the longer time required for cooling), will increase the likelihood of voids and significantly decrease the physical properties of the part. If a design requires wall thicknesses greater than the suggested limit of 4.0 mm, structural foam resins should be considered, even though additional processing technology would be required.

In general, a uniform wall thickness should be maintained throughout the part. If variations are necessary, avoid abrupt changes in thickness by the use of transition zones, as shown in the Suggested Design for Wall Thickness Transition Zone illustration. Transition zones will eliminate stress concentrations that can significantly reduce the impact strength of the part. Also, transition zones reduce the occurrence of sinks, voids, and warping in the molded parts.

A wall thickness variation of ��25% is acceptable in a part made with a thermoplastic having a shrinkage rate of less than 0.01 mm/mm. If the shrinkage rate exceeds 0.01 mm/mm, then a thickness variation of ��15% is permissible.


Tel: (86)-755-86212466     Fax: (86)-755-22713700
Website:http://www.longmold.com or http://www.mould.us
E-mail:info@longmold.com or sales@longmold.com
Copyright© 2005 Longmold Technology Co.,Ltd. All Rights Reserved